Re: [PATCH v3] Fix variadic type mismatch in pushutfchar -- passes long but %U expects unsigned long

Also if "%U" means UTF-8, the only acceptable values for a standard result
must be positive and with at most 21 bits (in the range 0 to 0x1FFFFFL);
passing a long or unsigned long would not change anything for such valid
values; Even with the non-standard UTF-8 (from the obsolete first RFC that
described it), it was only possible to encodode values up to 31 bits, so
long or unsigned long did not change the result for any signed or unsigned
integer type with an encoded binary length of at least 32-bit (true for
both "long" and "unsigned long" in C, even on 8-bit platforms where both
"int" and "short" were stored on 16 bits).

I don't know exactly how  "lobject.c" in Lua sources is supposed to handle
any value that does not fit in the supported range (either from the UCS
standard, or the wider range from the obsolete -RFC version that was
proposed informally in early ISO 10646 where it was still not a a
standardized encoding form but just a recommendation, that was finally not
adopted by the joint efforts of the ISO the UTC, the RFC Editor for the UCS
standard). None of these standards have allowed negative values for code
points (and in fact many system-level I/O APIs use negative valuse not for
code points, but only -1 as a special "end of file" condition indicating
there's no "character" to retrieve from an input stream, other negative
values are not used in any API standard I know for common language bindings
in C, C++, Java, Javascript, etc.).

Le jeu. 26 févr. 2026 à 14:22, Luiz Henrique de Figueiredo <
[email protected]> a écrit :

> %U means UTF-8. See lobject.c:
>
> case 'U': { /* an 'unsigned long' as a UTF-8 sequence */
>
>
> On Thu, 26 Feb 2026 at 10:17 Denis Dos Santos Silva <[email protected]>
> wrote:
>
>> c89/c90 ANSI:
>> lua_pushfstring(L, "%lu", (unsigned long)code)
>>
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